Our Laparotomy Sponges are made of 100% cotton gauze. The sponges are soft, have high absorbency, and are packaged pre-washed. All edges are folded in and stitched with cotton thread, preventing the possibility of any loose fibers. Does not contain natural rubber latex.- Laparotomy Sponge, X-Ray, 12" x 12", 4-Ply, 300/cs